drifter (Noun)
A person who is using an electronic device (i.e. texting, facebook or any other social media) while walking and not paying attention to their surroundings. They typically drift across the side walk and cutoff or collide with other people on the side walk. They are clueless and seem to be on another planet inside their phones. 99% of the time their heads are down while walking, they only lift their heads to take a sip from the coffee they are usually carrying.
The drifter (Noun) was meandering down the street and almost got hit by a car and then walked into a telephone pole.